Product overview
Elgato Key Lights are app- and Wi-Fi-controlled LED panels aimed at streaming, video calls, and studio lighting. They have no physical brightness/temperature dials — everything is driven over the network via Elgato Control Center (macOS / Windows) or the mobile app, or via Stream Deck. Pairing happens once; after that the light rejoins its network on every power-on.
The lineup:
| Model | Form factor | Bands | Notes |
|---|---|---|---|
| Key Light (MK.I) | Large edge-lit panel | 2.4 GHz only | Original 2019/2020; ~2800 lm |
| Key Light (MK.2) | Large edge-lit panel | 2.4 / 5 GHz | Revised hardware |
| Key Light Air | Smaller panel | 2.4 / 5 GHz | ~1400 lm |
| Key Light Mini | Compact, battery | 2.4 / 5 GHz | Portable |
| Key Light Neo | Compact panel | 2.4 / 5 GHz | Newer budget option |
Control is via a simple JSON API on port 9123 once paired — handy for scripting (e.g. auto-on when the webcam activates).
My unit
- Two Key Light A800 (MK.I) panels in the home studio.
- Purchased 24 April 2020. MK.I = 2.4 GHz only, which is the root of most pairing pain.
Identifying MK.I vs MK.2
It matters because the MK.I is 2.4 GHz only. If unsure, check Elgato's identification guide (linked below) — MK.2 added 5 GHz support and revised internals.
Network constraints (MK.I)
| Constraint | Supported | Not supported |
|---|---|---|
| Wireless standard | 802.11 b/g/n | AC / AD / AX |
| Frequency | 2.4 GHz | 5 GHz |
| Encryption | WPA2 (AES), WPA (TKIP/AES) | WEP, WPA2-Enterprise, WPA3 |
Pairing methods
| Device | Method | Notes |
|---|---|---|
| macOS / iOS | Apple WAC | Only path on Apple; flaky; hangs at "Preparing…" |
| iPhone (iOS) | Apple WAC | More reliable than macOS in practice |
| Windows / Android | Direct connect to light's AP | Bypasses WAC entirely; best fallback if Apple fails |
Factory reset (MK.I)
- Hold the power switch in the II position for 10 seconds until the light blinks 3×.
- Release, wait 5 seconds.
- Switch to I to power on; allow ~15s to boot.
This clears stored Wi-Fi credentials and returns the light to setup mode.
Troubleshooting
Setup hangs at "Gathering information… Preparing…"
This is the classic MK.I failure. Two stacked causes:
- Band steering pushing the 2.4 GHz-only light onto 5 GHz.
- Apple's WAC protocol stalling (macOS and iOS both pair only via WAC).
Fix that worked (UniFi + Mac/iPhone setup):
- Factory-reset the light (see above).
- Create a dedicated 2.4 GHz SSID — in UniFi set the SSID to Manual to unlock security options:
- Radio Band: 2.4 GHz only
- Security: WPA2 only (NOT mixed WPA2/WPA3, NOT WPA3)
- PMF: Optional (Disabled if it still won't join)
- Network/VLAN: same as the controlling Mac (so mDNS discovery works after)
- Client Device Isolation: off · Hide SSID: off · Guest network: no
- Eliminate multi-AP roaming: SSID → Broadcasting APs → Specific → nearest AP only, and move the light next to that AP.
- Pair from the iPhone (Control Center app, joined to the 2.4 GHz SSID) — this is what finally worked. iOS WAC succeeds more often than macOS once the network is clean and single-AP.
- Once joined, the light shows up in Control Center on the Mac automatically (same subnet).
- Update firmware straight away — fixes future WAC flakiness.
If Apple devices still hang: pair from Windows or Android instead. These bypass WAC entirely — the computer connects directly to the light's own broadcast, pushes credentials, then reconnects to the normal network. Windows also has a manual pairing mode where the SSID and password are typed in by hand (must match exactly, including case).
Light paired but missing from Control Center
- mDNS/Bonjour doesn't cross VLANs — keep the light and the controlling computer on the same subnet, or enable mDNS reflection.
- In Control Center → Preferences, check Reveal Hidden Accessories (if greyed out, nothing is hidden — the light genuinely isn't paired).
- Guest networks block discovery entirely.
Light shows under Wi-Fi "new device" but won't appear in Control Center
That means it's broadcasting WAC setup mode but hasn't joined a network yet. Configure it from the Wi-Fi menu / phone, not by waiting in Control Center.
Intermittent detection after pairing
Known Control Center quirk — lights that pair fine can later be found only intermittently regardless of network. If hit, it's a software-discovery issue, not the network. Workarounds: relaunch Control Center, or talk to the light directly via the port 9123 API.
Last resort
If it still fails on a direct, non-WAC connection right next to the AP, suspect a faulty Wi-Fi radio / firmware on that unit. MK.I from 2020 is well out of warranty, but Elgato support can advise.
Links